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Very strong mag. 6.8 earthquake - New Zealand on Thursday, 4 March 2021 at 17:41 (GMT) - information

Very strong mag. 6.8 earthquake - South Pacific Ocean, New Zealand, on Friday, Mar 5, 2021 at 6:41 am (GMT +13)

This quake was likely a foreshock of the 8.1 quake South Pacific Ocean, New Zealand, Mar 4, 2021 7:28 am (GMT -12), which followed after 1 hour and 47 minutes.
Very strong mag. 6.8 earthquake - South Pacific Ocean, New Zealand, on Friday, Mar 5, 2021 at 6:41 am (GMT +13) Very strong mag. 6.8 earthquake - South Pacific Ocean, New Zealand, on Friday, Mar 5, 2021 at 6:41 am (GMT +13)

Very strong magnitude 6.8 earthquake at 33 km depth

4 Mar 17:49 UTC: First to report: GEONET (NZ) after 8 minutes.
4 Mar 17:52: Magnitude recalculated from 6.7 to 6.8.

Earthquake details

Date & timeMar 4, 2021 17:41:23 UTC
Local time at epicenterFriday, Mar 5, 2021 at 6:41 am (GMT +13)
StatusConfirmed
Magnitude6.8
Depth33.0 km
Epicenter latitude / longitude29.55083°S / 177.42708°W (South Pacific Ocean, New Zealand)
Antipode29.551°N / 2.573°E
Shaking intensityLight shaking
Felt3 reports
Primary data sourceGEONET (NZ) (Earthquake Commission and Geological Survey, New Zealand)
Nearest volcanoRaoul Island (57 km / 35 mi)
Nearby towns and cities
Weather at epicenter at time of quakeOvercast Clouds 23.1°C (74 F), humidity: 84%, wind: 7 m/s (14 kts) from NE
Estimated seismic energy released1 x 1015 joules (278 gigawatt hours, equivalent to 2.4 x 105 tons of TNT or 14.9 atomic bombs!) | about seismic energy
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag.DepthLocationSource
6.833 kmNew ZealandGEONET (NZ)
7.453 kmKermadec Islands, New ZealandUSGS
7.442 kmKermadec Islands, New ZealandGFZ
7.356 kmKermadec Islands, New ZealandGeoAu
7.449 kmKERMADEC ISLANDS, NEW ZEALANDEMSC
7.342 kmKermadec Islands, New ZealandBMKG
7.520 kmKermadec Islands, New Zealand [Sea: New Zealand]INGV

Seismograms

Seismic station: South Karori, New Zealand (SNZO/IU network) | Distance from quake: 1488 km / 924 mi | Show on map | Station Info
Seismic station South Karori, New Zealand: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (7)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Massey, West Auckland / Light shaking (MMI IV) : Was woken from dreaming. Was instantly clear it was a substantial earthquake but didn't feel alarmed as it built gradually & was realtively gentle - no jolts. My bedroom is on second level - My bed started to sway/shake - husband called out for downstairs | 10 users found this interesting.  
West Harbour, Auckland / Weak shaking (MMI III) / 5-10 s : Lying in bed I woke and then felt the earthquake. I could hear the bolts in my wall door rattle and my bed was moving. | 8 users found this interesting.  
Amodeo bay (1033.1 km SW of epicenter) [Map] / not felt : Not felt | 4 users found this interesting.  
North Shore, Auckland / not felt : I’m not sure if I felt it, was waken at 03:45 and 06:45 when the quake happened! | One user found this interesting.  
Hamilton (1136 km SW of epicenter) [Map] / not felt (reported through our app)
CUAUTLA / Violent shaking (MMI IX)
Auckland / not felt

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